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  2. Proportional symbol map - Wikipedia

    en.wikipedia.org/wiki/Proportional_symbol_map

    A proportional symbol map or proportional point symbol map is a type of thematic map that uses map symbols that vary in size to represent a quantitative variable. [1]: 131 For example, circles may be used to show the location of cities within the map, with the size of each circle sized proportionally to the population of the city. Typically ...

  3. Flow map - Wikipedia

    en.wikipedia.org/wiki/Flow_map

    1838 map of pre-railroad cargo traffic in Ireland, one of the first thematic maps to use proportional symbols. The earliest known map to visually represent the volume of flow were two maps by engineer Henry Drury Harness, published in 1838 as part of a report on the potential for railroad construction in Ireland, showing the quantity of cargo traffic by road and canal.

  4. Sankey diagram - Wikipedia

    en.wikipedia.org/wiki/Sankey_diagram

    Example of a Sankey diagram Sankey's original 1898 diagram showing energy efficiency of a steam engine. Sankey diagrams are a data visualisation technique or flow diagram that emphasizes flow/movement/change from one state to another or one time to another, [1] in which the width of the arrows is proportional to the flow rate of the depicted extensive property.

  5. Thematic map - Wikipedia

    en.wikipedia.org/wiki/Thematic_map

    [10] [12] Included were early chorochromatic and flow maps, and possibly the first proportional point symbol and dasymetric maps. John Snow's cholera map about the cholera deaths in London in the 1840s, published 1854. Another example of early thematic mapping comes from London physician John Snow. Though disease had been mapped thematically ...

  6. Multivariate map - Wikipedia

    en.wikipedia.org/wiki/Multivariate_map

    A bivariate map or multivariate map is a type of thematic map that displays two or more variables on a single map by combining different sets of symbols. [1] Each of the variables is represented using a standard thematic map technique, such as choropleth , cartogram , or proportional symbols .

  7. Cartogram - Wikipedia

    en.wikipedia.org/wiki/Cartogram

    A cartogram (also called a value-area map or an anamorphic map, the latter common among German-speakers) is a thematic map of a set of features (countries, provinces, etc.), in which their geographic size is altered to be directly proportional to a selected variable, such as travel time, population, or gross national income. Geographic space ...